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What わ says is "I am emotionally invested in what I say in this sentence." There's no implication of "hey, this information should be news to you, so pay attention" -- in that situation, you need わよ. よ grabs lapels and demands involvement; わ waves an arm and invites it.
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MattAug 28 '11 at 9:14

@Dave M G What can I say, I'm communal-minded :) seriously, the analysis of よ is the heavy lifting here.
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MattAug 29 '11 at 11:29

@Matt Does the わ always have to come first? Can it be よわ as well?
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AtaraxiaSep 7 '13 at 13:08

Disclaimer: I'm just a random Japanese native and my answer below isn't based on formal research or anything like that.

The feminine 「わ」 seems to have become almost extinct. You see it in text books and novels, but it's extremely rare to hear people actually using it.

The kansai 「わ」 is different from the feminine 「わ」. The feminine 「わ」 is used in 標準語 or 東京弁 and not in 関西弁. The kansai 「わ」 is only used in 関西弁.

The kansai 「わ」 is used by both male and female, and has no feminine effect even when used by female. The feminine 「わ」 does have an feminine effect, and is sometimes used to signal that the character in a book is a female etc. The two わ are also pronounced differently.

Interestingly, 「わよ」 is exclusively feminine 「わ」. Male usage of 「わよ」 is associated with transgender and homo-sexuality (talents like 美輪明宏 use it, presumably to emphasize their femininity?). Usage of わよ seems to be rare among Japanese female (at least in younger generations).

So to summarize, Japanese female mostly use something other than わ nowadays.

Funny: I can probably not claim having as much daily experience of Japanese as you, but I am pretty sure I hear the feminine わ used on a daily basis (most often by older women, but every once in a while, by younger girls as well). I do live in Kansai, so the "Kansai わ" also happens sometimes (not all that much among my friends), but definitely also the "feminine わ"... What exactly do you mean by "extremely rare"? are you sure it does not reflect more on your social circles than on general use?
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Dave♦Aug 27 '11 at 15:05

@Dave: Well, at the end of the day it's just based on my non-scientific, personal experience so I can't really specifically tell you what "rare" means. I lived in kansai/tokyo/hokkaido if you are curious. I don't think it's possible to use feminine わ in 関西弁. I mean it depends on your definition but if わ is used in 関西弁, it doesn't have this signalling effect that the speaker is female, which a わ in 標準語/東京弁 would have.
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Enno ShiojiAug 27 '11 at 15:27

Sorry for the confusion: while I live in Kansai and while sometimes conversations have bits of 関西弁 to them, most of the people I know speak mostly 標準語. The occurrences of わ I was mentioning were most definitely not in pure 関西弁 (or 京都弁 to be exact) conversations. Anyway, as I said: I'm sure you have a lot more practice than me, so I was just honestly curious, since it never occurred to me that it was so rare...
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Dave♦Aug 27 '11 at 16:40

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I'm pretty sure that this is 関西弁 influence on their 標準語, I live out East and my experience correlates with Shioji's. Unless you happen to be friends with a lot of conservative-talking women!
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MattAug 27 '11 at 22:59

In general, sentence final particle use varies a lot depending on the region. In Kyoto, where I live, for example, men and women both use わ freely, and even throw out the occasional 「わよ」. I think it sounds softer, more restrained and less insistent than よ but that's only my personal opinion. I haven't seen a thorough breakdown of the usage for the two, but I think you'd have to dig through academic papers to find something. I've been told that the meaning is essentially the same.